/*
 * Copyright (c) 2010-2011, Pieter Noordhuis <pcnoordhuis at gmail dot com>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *   * Neither the name of Redis nor the names of its contributors may be used
 *     to endorse or promote products derived from this software without
 *     specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __HIREDIS_LIBEV_H__
#define __HIREDIS_LIBEV_H__

#include <stdlib.h>
#include <sys/types.h>
#include <ev.h>
#include "../hiredis.h"
#include "../async.h"

typedef struct redisLibevEvents {
    redisAsyncContext *context;
    struct ev_loop *loop;
    int reading, writing;
    ev_io rev, wev;
} redisLibevEvents;

static void redisLibevReadEvent(EV_P_ ev_io

*watcher,
int revents
) {
#if EV_MULTIPLICITY
((void)loop);
#endif
((void)revents);

redisLibevEvents *e = (redisLibevEvents *) watcher->data;
redisAsyncHandleRead(e
->context);
}

static void redisLibevWriteEvent(EV_P_ ev_io

*watcher,
int revents
) {
#if EV_MULTIPLICITY
((void)loop);
#endif
((void)revents);

redisLibevEvents *e = (redisLibevEvents *) watcher->data;
redisAsyncHandleWrite(e
->context);
}

static void redisLibevAddRead(void *privdata) {
    redisLibevEvents *e = (redisLibevEvents *) privdata;
    struct ev_loop *loop = e->loop;
    ((void) loop);
    if (!e->reading) {
        e->reading = 1;
        ev_io_start(EV_A_ & e->rev);
    }
}

static void redisLibevDelRead(void *privdata) {
    redisLibevEvents *e = (redisLibevEvents *) privdata;
    struct ev_loop *loop = e->loop;
    ((void) loop);
    if (e->reading) {
        e->reading = 0;
        ev_io_stop(EV_A_ & e->rev);
    }
}

static void redisLibevAddWrite(void *privdata) {
    redisLibevEvents *e = (redisLibevEvents *) privdata;
    struct ev_loop *loop = e->loop;
    ((void) loop);
    if (!e->writing) {
        e->writing = 1;
        ev_io_start(EV_A_ & e->wev);
    }
}

static void redisLibevDelWrite(void *privdata) {
    redisLibevEvents *e = (redisLibevEvents *) privdata;
    struct ev_loop *loop = e->loop;
    ((void) loop);
    if (e->writing) {
        e->writing = 0;
        ev_io_stop(EV_A_ & e->wev);
    }
}

static void redisLibevCleanup(void *privdata) {
    redisLibevEvents *e = (redisLibevEvents *) privdata;
    redisLibevDelRead(privdata);
    redisLibevDelWrite(privdata);
    free(e);
}

static int redisLibevAttach(EV_P_ redisAsyncContext

*ac) {
redisContext *c = &(ac->c);
redisLibevEvents *e;

/* Nothing should be attached when something is already attached */
if (ac->ev.data != NULL)
return REDIS_ERR;

/* Create container for context and r/w events */
e = (redisLibevEvents *) malloc(sizeof(*e));
e->
context = ac;
#if EV_MULTIPLICITY
e->loop = loop;
#else
e->
loop = NULL;
#endif
e->
reading = e->writing = 0;
e->rev.
data = e;
e->wev.
data = e;

/* Register functions to start/stop listening for events */
ac->ev.
addRead = redisLibevAddRead;
ac->ev.
delRead = redisLibevDelRead;
ac->ev.
addWrite = redisLibevAddWrite;
ac->ev.
delWrite = redisLibevDelWrite;
ac->ev.
cleanup = redisLibevCleanup;
ac->ev.
data = e;

/* Initialize read/write events */
ev_io_init(&e
->rev,redisLibevReadEvent,c->fd,EV_READ);
ev_io_init(&e
->wev,redisLibevWriteEvent,c->fd,EV_WRITE);
return REDIS_OK;
}

#endif
